Apparatuses and methods for negative pressure wound therapy

• US 10,507,141 B2
• Filed: 02/06/2018
• Issued: 12/17/2019
• Est. Priority Date: 05/23/2012
• Status: Active Grant

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Allen, Julie, Askem, Ben Alan, Collinson, Sarah Jenny, Gowans, Philip, Mehta, Steven Carl, Nicolini, Derek, Zagrabski, Carol
• Primary Examiner(s): Mensh, Andrew J
• Application Number:
  US15/890,218
• Publication Number:
  US 20180168869A1
• Time in Patent Office: 679 Days
• Field of Search: 604319
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• CPC Class Codes: A61F 13/05 specially adapted for use with sub-pressure or over-pressure therapy, wound drainage or wound irrigation, e.g. for use with negative-pressure wound therapy [NPWT]
• CPC Class Codes: A61F 2013/00238 characterised by way of knitting or weaving
• CPC Class Codes: A61M 1/64 Containers with integrated suction means containers not adapted for subjection to vacuum A61M1/69
• CPC Class Codes: A61M 1/79 Filters for solid matter specially adapted for dental use A61C17/065
• CPC Class Codes: A61M 1/86 Connectors between drainage tube and handpiece, e.g. drainage tubes detachable from handpiece
• CPC Class Codes: A61M 1/913 having a bridging element for transferring the reduced pressure from the connector to the dressing
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/962 having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction
• CPC Class Codes: A61M 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 1/985 the dressing itself forming the collection container
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2205/7536 allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes

Abstract

Disclosed herein are several embodiments of a negative pressure appliance and methods of using the same in the treatment of wounds. Some embodiments are directed towards wound dressings comprising a liquid and gas permeable transmission layer, an absorbent layer for absorbing wound exudate, the absorbent layer overlying the transmission layer, a gas impermeable cover layer overlying the absorbent layer and comprising a first orifice, wherein the cover layer is moisture vapor permeable. Some embodiments are directed to improved fluidic connectors or suction adapters for connecting to a wound site, for example using softer, kink-free conformable suction adapters.

Claims

1. An apparatus to provide suction to a wound site comprising:

a wound dressing comprising;

an absorbent layer for absorbing wound exudate from the wound site,

a transparent cover layer overlying the absorbent layer and extending over the entirety of the absorbent layer, the transparent cover layer_comprising an opening; and

an obscuring layer between the absorbent layer and the transparent cover layer that at least partially obscures visualization of the absorbent layer from above the transparent cover layer;

a fluidic connector attached to the wound dressing comprising;

a spacer layer comprising a proximal end, an elongate middle portion, and a distal end;

a transparent top layer constructed from a liquid impermeable material provided over the spacer layer, the transparent top layer defining an upper surface of the fluidic connector;

a bottom layer constructed from a liquid impermeable material provided below the spacer layer, wherein the transparent top layer and the bottom layer are sealed together around a perimeter thereof to enclose the spacer layer and wherein the spacer layer is in contact with the transparent top layer and the bottom layer; and

one or more apertures in the bottom layer beneath the distal end of the spacer layer, wherein a distal end of the bottom layer of the fluidic connector is positioned over the transparent cover layer of the wound dressing with the one or more apertures in the bottom layer being positioned over the opening in the transparent cover layer; and

a portion of absorbent material positioned below the distal end of the spacer layer, wherein the portion of absorbent material is visible around an outer perimeter of the spacer layer of the fluidic connector through the transparent top layer of the fluidic connector and is configured to indicate saturation of the absorbent layer by the wound exudate.

2. The apparatus of claim 1, wherein the apparatus is configured to prevent the wound exudate from escaping the wound dressing through the opening in the transparent cover layer.

3. The apparatus of claim 1, wherein the transparent top layer and the bottom layer are heat sealed together around the perimeter.

4. The apparatus of claim 1, wherein the distal end of the spacer layer is enlarged relative to a width of the elongate middle portion of the spacer layer and a width of the proximal end of the spacer layer.

5. The apparatus of claim 1, wherein the distal end of each of the transparent top layer and the bottom layer is enlarged relative to a width of the elongate middle portion of the transparent top layer and the bottom layer, respectively, and a width of the proximal end of the transparent top layer and the bottom layer, respectively.

6. The apparatus of claim 1, wherein the spacer layer comprises one of a 3D knitted or 3D fabric material, foam, a porous material and non-woven material.

7. The apparatus of claim 1, wherein the distal end of the bottom layer comprises adhesive.

8. The apparatus of claim 1, wherein the spacer layer has a substantially rectangular cross-sectional dimension.

9. The apparatus of claim 1, wherein the spacer layer is adhered to at least one of the transparent top layer and the bottom layer.

10. The apparatus of claim 1, wherein the absorbent layer comprises superabsorber material.

11. The apparatus of claim 10, wherein said superabsorber material comprises sodium polyacrylate superabsorber particles.

12. The apparatus of claim 10, wherein said superabsorber material comprises superabsorber fibers comprising carbomethoxycellulose materials.

13. The apparatus of claim 1, wherein the wound dressing comprises a wound contact layer comprising openings for transmission of the suction to the wound site.

14. The apparatus of claim 13, wherein the transparent cover layer is attached to the wound contact layer around a perimeter, thereby defining an interior space comprising the absorbent layer and the obscuring layer.